In this illustration, we see the same elements as in the previous figure in their same positions, excluding the data packets. Here, data packets travel from H1 and H2 into R1. Inside of R1 we see both light and dark blue packets in the queue, five in total. The first three packets have been marked with a gray stripe, the fourth with a black stripe, and the fifth with a gray stripe. An expanded view of R1 shows us the process of policing and marking these data packets: first we see a clock, which is identified in a key as depicting "metering and policing." An arrow points rightward from the clock to a black stripe, then from the black stripe diagonally upwards to the left to a data packet, and finally rightward to the data packet bearing the black stripe. This process is identified as "Packet marking and policing."